US 12,116,470 B2
Composite polyvinyl alcohol preservative film, preparation method and application thereof
Shuhao Qin, Guiyang (CN); Li Zhang, Bijie (CN); Shanshan Luo, Guiyang (CN); Juan Li, Guiyang (CN); Chengtao Gao, Guiyang (CN); Yanwen Wang, Tongren (CN); and Lu Song, Guiyang (CN)
Assigned to GUIZHOU MATERIAL INDUSTRIAL TECHNOLOGY INSTITUTE, Guiyang (CN)
Filed by Guizhou Material Industrial Technology Institute, Guiyang (CN)
Filed on Mar. 24, 2023, as Appl. No. 18/126,297.
Claims priority of application No. 202210553702.7 (CN), filed on May 20, 2022.
Prior Publication US 2023/0374272 A1, Nov. 23, 2023
Int. Cl. C08K 9/06 (2006.01); C08J 5/18 (2006.01); C08K 3/22 (2006.01); C09C 1/30 (2006.01)
CPC C08K 9/06 (2013.01) [C08J 5/18 (2013.01); C08K 3/22 (2013.01); C09C 1/3027 (2013.01); C09C 1/3081 (2013.01); C09C 1/309 (2013.01); C08J 2329/04 (2013.01); C08K 2003/2241 (2013.01); C08K 2201/005 (2013.01)] 2 Claims
 
1. A preparation method of a composite polyvinyl alcohol preservative film, comprising following steps:
dispersing 1 gram (g) of silicon dioxide nanoparticles with each particle size of 1000 nanometers (nm) in 50 milliliters (mL) of toluene solution, adding 1.8 mL of 2-cyanopropyl triethoxysilane (CTES) into the toluene solution for a reaction at 100 degrees Celsius (° C.) for 24 hours (h) to obtain a reaction solution; cooling the reaction solution down, and then filtering, washing and drying to obtain a solid, followed by adding the solid into a dilute sulfuric acid solution to obtain a mixed dilute sulfuric acid solution; performing a reflux on the mixed dilute sulfuric acid solution at 90° C. for 3 h, and then cooling, filtering, washing and drying to obtain the modified silicon dioxide nanoparticles; wherein a concentration of the dilute sulfuric acid solution is 49 wt %;
taking 10 g of PVA to be added into 100 mL of deionized water, adding 1 mole per litter (mol/L) of hydrochloric acid solution into the deionized water to adjust a potential of hydrogen (pH) value of the deionized water to be 3; raising a temperature of the deionized water to 90° C. for dissolving the PVA for 2 h with a continuous stirring to obtain a mixed solution; adding 3 g of the modified silicon dioxide nanoparticles into the mixed solution to mix, and then, adding 1 g of titanium dioxide nanoparticles with each particle size of 60 nm into the mixed solution, followed by stirring for 1 h; placing the mixed solution for standing overnight to obtain a standing solution, and defoaming the standing solution and scraping a film to obtain the composite polyvinyl alcohol preservative film; wherein a thickness of the composite polyvinyl alcohol preservative film is 0.02 millimeters (mm).